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[QUOTE=alocky;907050]If I might attempt to summarise:
Step1. Take as long an exposure as you can, stars nice and tight, no planes or satellites, sensor not saturating, particularly on the interesting bits.
You don't have to worry too much about satellites if only a few subs have them. They then disappear or weaken greatly if you use a stacking algorithm that rejects "outliers" - data that is outside the statisical norm which is assumed to be an artifact, hot pixel or the like. If you use sum or add then they of course stay in. The more subs you have the more these artifacts fade because of the statistical nature of the stacking algorithms that determine what value should be reasonably expected in a particular pixel. That needs a wide enough sample to be more and more useful in getting rid of outliers.
Greg.
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